61523663 has 4 divisors (see below), whose sum is σ = 65142720. Its totient is φ = 57904608.

The previous prime is 61523659. The next prime is 61523681. The reversal of 61523663 is 36632516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61523663 - 2² = 61523659 is a prime.

It is a super-2 number, since 2×61523663² = 7570322217875138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61523603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1809503 + ... + 1809536.

It is an arithmetic number, because the mean of its divisors is an integer number (16285680).

Almost surely, 2^61523663 is an apocalyptic number.

61523663 is a deficient number, since it is larger than the sum of its proper divisors (3619057).

61523663 is a wasteful number, since it uses less digits than its factorization.

61523663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3619056.

The product of its digits is 19440, while the sum is 32.

The square root of 61523663 is about 7843.7021233599. The cubic root of 61523663 is about 394.7729571688.

The spelling of 61523663 in words is "sixty-one million, five hundred twenty-three thousand, six hundred sixty-three".